NZQA registered unit standard
28888 version 1
Page 1 of 4
Title
Demonstrate knowledge of substation structures, insulators,
conductors and bus hardware
Level
4
Credits
7
Purpose
People credited with this unit standard are able to demonstrate
knowledge of: substation structures, insulators, conductors and
bus hardware; conductors and conductor hardware; insulators,
bus insulators, and insulator hardware; bus hardware and
fasteners; bus system maintenance; and condition assessment
for substation structures, insulators, conductors and bus
hardware.
Classification
Electricity Supply > Electricity Supply - Power System
Maintenance
Available grade
Achieved
Explanatory notes
1
This unit standard is intended for assessment off-job. The range statements and
evidence requirements across the unit standard can be applied according to industry
specific equipment, procedures, and processes as applied in the electricity supply
industry.
2
Performance and work practices in relation to the outcomes and evidence
requirements must comply with all current legislation, especially the Electricity Act
1992 and any subsequent amendments, and any regulations, codes of practice
recognised under that statute, Health and Safety in Employment Act 1992, the
Resource Management Act 1991, and their subsequent amendments, electricity
supply industry codes of practice and documented enterprise procedures. These
include the latest version of, Safety Manual – Electricity Industry (SM-EI) Wellington:
Electricity Engineers’ Association.
A full list of current legislation and industry codes is available from:
Infrastructure Industry Training Organisation
PO Box 1245
Hamilton 3240.
3
The phrase in accordance with industry requirements is implicit in all outcomes and
evidence requirements in this unit standard.
4
Definitions
Asset owner refers to the owner of an electricity supply network that takes its point of
supply from Transpower NZ, and delivers electricity to industrial, commercial and
residential customers.
Infrastructure ITO
SSB Code 101813
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
28888 version 1
Page 2 of 4
Industry requirements include all asset owner requirements; manufacturers’
specifications; and enterprise requirements which cover the documented workplace
policies, procedures, specifications, business, and quality management requirements
relevant to the workplace in which assessment is carried out.
Outcomes and evidence requirements
Outcome 1
Demonstrate knowledge of the function and location of structures, insulators, conductors
and bus hardware in a substation.
Evidence requirements
1.1
Function of structures, insulators, conductors and bus hardware in a substation
are described.
1.2
Location and equipment coding of structures, insulators, conductors, types of
cables and bus hardware in a substation is explained.
Outcome 2
Demonstrate knowledge of conductors and conductor hardware.
Evidence requirements
2.1
Common conductor types are identified.
Range
2.2
Jointing and terminating methods are explained.
Range
2.3
solid, stranded, rod, tube, channel in copper, aluminium and
aluminium.
may include but not limited to: performance, designs, assembly
and installation. Evidence of one jointing and terminating method
Joint termination testing is explained and demonstrated, and results are
interpreted.
Range
visual, resistance measurement, thermographic, contact
temperature.
Outcome 3
Demonstrate knowledge of insulators, bus insulators, and insulator hardware.
Evidence requirements
3.1
Common insulator types are identified.
Range
Infrastructure ITO
SSB Code 101813
disc, post, long-rod.
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
3.2
28888 version 1
Page 3 of 4
Components, construction and characteristics of insulators are identified and
explained.
Range
includes but is not limited to: cap, disc, stem and ball, mechanical
strength, insulator materials, creep path.
Outcome 4
Demonstrate knowledge of bus hardware and fasteners.
Evidence requirements
4.1
Common bus hardware and fasteners are identified.
Range
may include but is not limited to: socket, ball, clevis, tongue,
eye, shackle, turn buckle, bolts, nuts, washers.
4.2
Common acceptable assembly arrangements for bus hardware and fasteners in
a substation are identified and explained.
4.3
Bolt tightening and torqueing is explained and demonstrated.
Outcome 5
Demonstrate knowledge of bus system maintenance.
Evidence requirements
5.1
Requirements for outdoor bus work and supporting structure diagnostic
inspection and maintenance is explained.
5.2
Requirement for cleaning, protective coating and painting is explained.
Outcome 6
Demonstrate knowledge of condition coding assessment for substation structures,
insulators, conductors, and bus hardware.
Evidence requirements
6.1
Condition coding is described for substation structures, insulators,
conductors, and bus hardware.
Planned review date
Infrastructure ITO
SSB Code 101813
31 December 2020
 New Zealand Qualifications Authority 2016
NZQA registered unit standard
28888 version 1
Page 4 of 4
Status information and last date for assessment for superseded versions
Process
Version Date
Last Date for Assessment
Registration
1
17 March 2016
N/A
Consent and Moderation Requirements (CMR) reference
0120
This CMR can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Please note
Providers must be granted consent to assess against standards (accredited) by NZQA,
before they can report credits from assessment against unit standards or deliver courses
of study leading to that assessment.
Industry Training Organisations must be granted consent to assess against standards by
NZQA before they can register credits from assessment against unit standards.
Providers and Industry Training Organisations, which have been granted consent and
which are assessing against unit standards must engage with the moderation system that
applies to those standards.
Requirements for consent to assess and an outline of the moderation system that applies
to this standard are outlined in the Consent and Moderation Requirements (CMR). The
CMR also includes useful information about special requirements for organisations wishing
to develop education and training programmes, such as minimum qualifications for tutors
and assessors, and special resource requirements.
Comments on this unit standard
Please contact the Infrastructure Industry Training Organisation at
qualifications@infrastructureito.org.nz if you wish to suggest changes to the content of this
unit standard.
Infrastructure ITO
SSB Code 101813
 New Zealand Qualifications Authority 2016